For what you guys might think it could be worth, 2c perhaps
Re =Rho * v * l/ Ny
With units : Re [1]= Density [kg/m3] * speed [m/s] * length [m] / Kinematic viscosity [mē/s]
The formula reveals the secrets you are discussing.
Like already said, it expresses the relationship between the momentum-forces and the viscous forces.
However, it also expresses the difference in having different 'l' ; the charecteristic length ( or diameter in case of flow in a tube ).
Like someone already said, it works like a scale-factor for compairing different sizes of objects sorrounded by a moving fluidum.
It also works as a meter in other ways. (like it also explains why flow charecteristics vary depending on air pressure (altitude))
Now, Mr. Dick, flame me please but don't expect me to be nice in return.
Cheers,
Ikaros